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 KrKHeavy Artillery For The Little GuyPremium
join:2000-01-17
Tulsa, OK
 ·AT&T DSL Service
2 edits | reply to jobias
Re: Thanks Comcast! said by jobias:This is a silly argument. Seriously, what do you think cable nodes use to connect to the headend? Coax? Really? Cause you'd be wrong. No, it's not silly. Each DSL user is connected directly back to the RT or CO. (Often called dedicated run). At that point, the connections of all the DSL users on the RT is combined and goes over fiber back to the "Cloud" if you will.
That means to experience slowdown, the *entire RT* has to be overloaded to the point the fiber connection from the RT's capacity is exceeded.
Now, with Cable TV, it's different. YES, Fiber comes to the Node... But then the node goes out on Coax and connects many homes.... 500... I'm not really sure. To experience slowdown, if people on your Coax run are overloading it, you will slowdown. The bandwidth capacity of Coax is a lot less then fiber, and if you have dozens of homes on one run, it's a lot easier to overload the connection **BEFORE** it gets back to the Node which is where the fiber is.
Basically, yes, it's possible for an RT to be oversubscribed.... and everyone on that RT to experience slowdown.... *but* it's a *lot* more likely that a cable run with many users on it will experience slowdowns because simply put, there's a ton of people sharing one coax connection run back to the Node. So with DSL, all the users combined on an RT have to overload it's *fiber* connection, whereas with cable, all the users on that one run have to overload it's *Coax* connection.
I can't really explain it any clearer then this.
Cool, here's an image that shows it well:
Typical DSL setup. Note the direct connections to the RT's and CO's.
Now, typical Cable setup. Note the runs of coax from the node with tons of houses all on the same run.
'Nuff said, methinks. | |
 codeePremium
join:2001-10-01
Minneapolis, MN | said by KrK:Now, typical Cable setup. Note the runs of coax from the node with tons of houses all on the same run. 'Nuff said, methinks.
Do you SERIOUSLY think that there are still 2000 homes on a node?? 1000?? I hope you are joking with that picture because that is ridiculous....that is a good example of maybe 1999. I don't experience any slowdowns no matter what time of day it is. On a side note, I am totally against any sort of specific limit being stated by Comcast. It would probably be lower then what I sometimes use anyways, I mean look at the limits of the ISPs who DO state what they are - they're pretty low. Some months I may need to use 300+ gigs, and some I may use 50-75 gigs. I haven't ever recieved a letter/warning/bad behavior slip for anything before, and I'm pretty sure the limits wouldn't be as high as 300+ gigs. I like it the way it is now with no set limit. | |
KrKHeavy Artillery For The Little GuyPremium
join:2000-01-17
Tulsa, OK Reviews:
·AT&T DSL Service
| I don't know how old that is, or how many homes are on a Node.
Perhaps a Comcast employee would care to comment?
Irregardless, however, whether it's 500 or 25, the point still stands.
They are all on one shared coax back to the node. If your neighbors are "hogging" the connection, it can get overloaded and slowed down.
Look this isn't a DSL vs Cable: Which is better bashfest. This is merely a description of the topographical differences of the systems, and lends itself to why there are or aren't caps and why they'd be necessary.
Peace.
--
"Regulatory capitalism is when companies invest in lawyers, lobbyists, and politicians, instead of plant, people, and customer service." - former FCC Chairman William Kennard (A real FCC Chairman, unlike the current Corporate Spokesperson in the job!) | |
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